Implement difference clip rects with window rectangles

src/gpu/GrPipeline.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPipeline.h"
 
 #include "GrCaps.h"
 #include "GrDrawContext.h"
 #include "GrDrawTarget.h"
 #include "GrGpu.h"
 #include "GrPipelineBuilder.h"
 #include "GrProcOptInfo.h"
 #include "GrRenderTargetPriv.h"
 #include "GrXferProcessor.h"
 
 #include "batches/GrBatch.h"
 
 GrPipeline* GrPipeline::CreateAt(void* memory, const CreateArgs& args,
                                  GrXPOverridesForBatch* overrides) {
     const GrPipelineBuilder& builder = *args.fPipelineBuilder;
 
     GrPipeline* pipeline = new (memory) GrPipeline;
     GrRenderTarget* rt = args.fDrawContext->accessRenderTarget();
     pipeline->fRenderTarget.reset(rt);
     SkASSERT(pipeline->fRenderTarget);
     pipeline->fScissorState = *args.fScissor;
+    pipeline->fWindowRects = *args.fWindowRects;
     if (builder.hasUserStencilSettings() || args.fHasStencilClip) {
         const GrRenderTargetPriv& rtPriv = rt->renderTargetPriv();
         pipeline->fStencilSettings.reset(*builder.getUserStencil(), args.fHasStencilClip,
                                          rtPriv.numStencilBits());
         SkASSERT(!pipeline->fStencilSettings.usesWrapOp() || args.fCaps->stencilWrapOpsSupport());
     }
     pipeline->fDrawFace = builder.getDrawFace();
 
     pipeline->fFlags = 0;
     if (builder.isHWAntialias()) {
@@ skipping 182 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 
 bool GrPipeline::AreEqual(const GrPipeline& a, const GrPipeline& b,
                           bool ignoreCoordTransforms) {
     SkASSERT(&a != &b);
 
     if (a.getRenderTarget() != b.getRenderTarget() ||
         a.fFragmentProcessors.count() != b.fFragmentProcessors.count() ||
         a.fNumColorProcessors != b.fNumColorProcessors ||
         a.fScissorState != b.fScissorState ||
+        a.fWindowRects != b.fWindowRects ||
         a.fFlags != b.fFlags ||
         a.fStencilSettings != b.fStencilSettings ||
         a.fDrawFace != b.fDrawFace ||
         a.fIgnoresCoverage != b.fIgnoresCoverage) {
         return false;
     }
 
     // Most of the time both are nullptr
     if (a.fXferProcessor.get() || b.fXferProcessor.get()) {
         if (!a.getXferProcessor().isEqual(b.getXferProcessor())) {
             return false;
         }
     }
 
     for (int i = 0; i < a.numFragmentProcessors(); i++) {
         if (!a.getFragmentProcessor(i).isEqual(b.getFragmentProcessor(i), ignoreCoordTransforms)) {
             return false;
         }
     }
     return true;
 }